--  @testpoint:opengauss关键字catalog_name(非保留)，作为函数名
--关键字不带引号-成功
drop function if exists catalog_name;
create function catalog_name(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function catalog_name;

--关键字带双引号-成功
drop function if exists "catalog_name";
create function "catalog_name"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "catalog_name";

--关键字带单引号-合理报错
drop function if exists 'catalog_name';
create function 'catalog_name'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `catalog_name`;
create function `catalog_name`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/